Malicious PDF — malware analysis report

Static analysis result for SHA-256 54058be6aa3cf9e1…

MALICIOUS

PDF

102.7 KB Created: 2021-07-03 11:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 13ba014a055b01705bcc7e456bd9e39b SHA-1: cf22f06bfbd80015ef7376f83c73cacaa64b62de SHA-256: 54058be6aa3cf9e17b0376cfe9f534cc6b5a2e5e50310136e940399c3f4a8bdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple PDF files hosted on various domains, many of which appear to be compromised WordPress sites. This pattern is commonly used to distribute phishing content or further malware stages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrastone.com/userfiles/files/98523969909.pdf In PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3db6b5458f---fufuburuzuviloka.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/mixol.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/44e954906c0e635b84c0c268d6a6e668/42932847415.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/070690fb1ffbae5f9f0ea071d08ba9a8/64358997514.pdfIn PDF document text
    • https://spacio.hk/attachment/file/51963544908.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/mazeruzebi.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/42660899428.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/jepogusowababud.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/fiwenozemav.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cdc92ef9d---39672256157.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/logokumozogadajomejim.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609453a23ee3a---sukisefomatinum.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/12659888762.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/88579254076.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/47151377388.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/0gtsc91olgasnqt8t5a3oi9lg0/lugutina.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/kiwukiwololusuzuji.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210622080356.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/kewebudanegejuxelujosez.pdfIn PDF document text
    • https://hanmarklight.com/UploadFile/files/jenapoteva.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/85f1dd6ae15d608a55bdc0611ac99e3a/81040183473.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608920a8e447d---98246132155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+chivalry+of+a+failed+knight+staffel+2PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011d84.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11D84 18804 bytes
SHA-256: 4f08bd4e2dc81e1ce7e17bdcbd9eb3537238d2d599dd589f5a4824977f2b57b8
font_00_sfnt_off0000f4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB4 4588 bytes
SHA-256: 1acbfc65f1c68e758d696099e6937fca7fc972f4764440ca2ad43326f0318b8a
font_03_sfnt_off00013c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C18 21128 bytes
SHA-256: d2486edc7b813876e1326447aed34c7ae048c2cac2b3645d9217dfbb34ea9aa4
font_04_sfnt_off000170f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170F9 11108 bytes
SHA-256: 5c8a9c69cf331ed595f10ad021a4a042564c0faf149dd68ce2a7a079f9d61ff8

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